Vibrating screen assembly of dissimilar materials

Abstract

A vibrating screen assembly of dissimilar materials. A frame is composed of a first material having a coefficient of thermal expansion. At least one screen cloth is composed of a second material. A ratio of the coefficient of thermal expansion first material to the coefficient of thermal expansion of the second material is greater than one.

What is claimed is:  
     
       1. A vibrating screen assembly, which comprises: 
       at least one screen cloth;  
       a metal frame of different material from said screen cloth, said screen cloth bonded to said metal frame and wherein said metal frame has a coefficient of thermal expansion greater than a coefficient of thermal expansion of said screen cloth;  
       wherein said frame includes a pair of tubular sides, a pair of tubular ends, a plurality of tubular cross members extending between said sides, wherein said cross members are connected together by a plurality of rods; and  
       wherein the distance between said cross members and the distance between said rods forms a ratio from 0.1 to 1.0.  
     
     
       2. A vibrating screen assembly as set forth in claim  1  wherein said screen cloth is stainless steel. 
     
     
       3. A vibrating screen assembly as set forth in claim  1  wherein said metal frame is aluminum or aluminum alloy. 
     
     
       4. A vibrating screen assembly as set forth in claim  1  wherein corner gussets join said sides and said ends. 
     
     
       5. A vibrating screen assembly as set forth in claim  1  wherein the distance between said cross members and the distance between said rods forms a ratio of 0.635. 
     
     
       6. A vibrating screen assembly as set forth in claim  1  wherein said screen cloth is bonded to said metal frame by a high temperature adhesive. 
     
     
       7. A vibrating screen assembly as set forth in claim  6  wherein said high temperature adhesive is epoxy. 
     
     
       8. A vibrating screen assembly as set forth in claim  1  wherein urethane is juxtaposed between said screen cloth and said metal frame. 
     
     
       9. A vibrating screen assembly as set forth in claim  1  including two said screen cloths, an upper screen cloth and a lower screen cloth, each said screen cloth being bonded to said frame. 
     
     
       10. A vibrating screen assembly as set forth in claim  1  wherein each said screen cloth is bonded to said frame under tension. 
     
     
       11. A vibrating screen assembly of dissimilar materials, which comprises: 
       a frame of a first material having a coefficient of thermal expansion;  
       at least one screen cloth of a second material having a coefficient of thermal expansion, said screen cloth secured to said frame;  
       wherein the ratio of said coefficient of thermal expansion of said first material to said coefficient of thermal expansion of said second material greater than one;  
       wherein said frame includes a pair of tubular sides, a pair of tubular ends, a plurality of tubular cross members extending between said sides, wherein side said cross members are connected by a plurality of rods; and  
       wherein the distance between said cross members and the distance between said rods forms a ratio from 0.1 to 1.0.  
     
     
       12. A vibrating screen assembly as set forth in claim  11  where said frame is aluminum. 
     
     
       13. A vibrating screen assembly as set forth in claim  11  wherein said screen cloth is stainless steel. 
     
     
       14. A vibrating screen assembly as set forth in claim  11  wherein said frame has corner gussets joining said sides and said ends. 
     
     
       15. A vibrating screen assembly as set forth in claim  11  wherein each said screen cloth is secured to said frame under tension. 
     
     
       16. A method of manufacturing a vibrating screen assembly, which comprises: 
       assembling a frame of a first material having a coefficient of thermal expansion, said frame including a pair of sides and a pair of ends wherein said frame includes a pair of tubular sides, a pair of tubular ends, a plurality of tubular cross members extending between said sides, wherein side said cross members are connected by a plurality of rods;  
       wherein the distance between said cross members and the distance between said rods forms a ratio from 0.1 to 1.0;  
       placing a high temperature adhesive on said frame;  
       tensioning at least one screen cloth composed of a second material having a coefficient of thermal expansion less than said frame; and  
       adhesively securing said screen cloth to said frame.  
     
     
       17. A method of manufacturing a vibrating screen assembly as set forth in claim  16  wherein said step of placing a high temperature adhesive on said frame includes epoxy placed on said frame. 
     
     
       18. A method of manufacturing a vibrating screen assembly as set forth in claim  16  wherein said tensioning at least one screen cloth is performed in a jig which is clamped on said at least one screen cloth and then lowered on to said frame and said adhesive. 
     
     
       19. A method of manufacturing a vibrating screen assembly, which comprises: 
       molding a frame of a first material having coefficient of thermal expansion, wherein said frame includes a pair of tubular sides, a pair of tubular ends, a plurality of tubular cross members extending between said sides, wherein side said cross members are connected by a plurality of rods;  
       wherein the distance between said cross members and the distance between said rods forms a ratio from 0.1 to 1.0;  
       tensioning at least one screen cloth composed of a second material having a coefficient of thermal expansion less than said frame;  
       placing a high temperature adhesive on said frame; and  
       adhesively securing said screen cloth to said frame.